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North American Breeding Bird Survey  
Training: BBS Methodology - Description and Methods [page 2/34]
What is the BBS and why is it important?
BBS Annual Population Indices ExampleThe BBS is a long-term, continental avian monitoring program designed to track the status and trends of North American birds. It was initiated in 1966 by the U.S. Fish and Wildlife Service, and is now jointly coordinated by the USGS Patuxent Wildlife Research Center and Canadian Wildlife Service's National Wildlife Research Centre.

BBS data provide an index of population abundance that can be used to estimate population trends and relative abundances at various geographic scales. The BBS database contains data on over 650 bird species and provides trend estimates for > 420 species.

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